<!-- HTML header for doxygen 1.8.9.1-->
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
<meta http-equiv="X-UA-Compatible" content="IE=9"/>
<meta name="generator" content="Doxygen 1.8.6"/>
<meta name="robots" content="NOINDEX, NOFOLLOW" /> <!-- Prevent indexing by search engines -->
<title>Compute Library: src/core/CL/cl_kernels/harris_corners.cl File Reference</title>
<link href="tabs.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript" src="dynsections.js"></script>
<link href="navtree.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="resize.js"></script>
<script type="text/javascript" src="navtree.js"></script>
<script type="text/javascript">
  $(document).ready(initResizable);
  $(window).load(resizeHeight);
</script>
<link href="search/search.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="search/search.js"></script>
<script type="text/javascript">
  $(document).ready(function() { searchBox.OnSelectItem(0); });
</script>
<script type="text/x-mathjax-config">
  MathJax.Hub.Config({
    extensions: ["tex2jax.js"],
    jax: ["input/TeX","output/HTML-CSS"],
});
</script><script src="http://cdn.mathjax.org/mathjax/latest/MathJax.js"></script>
<link href="doxygen.css" rel="stylesheet" type="text/css" />
</head>
<body>
<div id="top"><!-- do not remove this div, it is closed by doxygen! -->
<div id="titlearea">
<table cellspacing="0" cellpadding="0">
 <tbody>
 <tr style="height: 56px;">
  <td style="padding-left: 0.5em;">
   <div id="projectname">Compute Library
   &#160;<span id="projectnumber">17.10</span>
   </div>
  </td>
 </tr>
 </tbody>
</table>
</div>
<!-- end header part -->
<!-- Generated by Doxygen 1.8.6 -->
<script type="text/javascript">
var searchBox = new SearchBox("searchBox", "search",false,'Search');
</script>
  <div id="navrow1" class="tabs">
    <ul class="tablist">
      <li><a href="index.xhtml"><span>Main&#160;Page</span></a></li>
      <li><a href="pages.xhtml"><span>Related&#160;Pages</span></a></li>
      <li><a href="namespaces.xhtml"><span>Namespaces</span></a></li>
      <li><a href="annotated.xhtml"><span>Data&#160;Structures</span></a></li>
      <li class="current"><a href="files.xhtml"><span>Files</span></a></li>
      <li>
        <div id="MSearchBox" class="MSearchBoxInactive">
        <span class="left">
          <img id="MSearchSelect" src="search/mag_sel.png"
               onmouseover="return searchBox.OnSearchSelectShow()"
               onmouseout="return searchBox.OnSearchSelectHide()"
               alt=""/>
          <input type="text" id="MSearchField" value="Search" accesskey="S"
               onfocus="searchBox.OnSearchFieldFocus(true)" 
               onblur="searchBox.OnSearchFieldFocus(false)" 
               onkeyup="searchBox.OnSearchFieldChange(event)"/>
          </span><span class="right">
            <a id="MSearchClose" href="javascript:searchBox.CloseResultsWindow()"><img id="MSearchCloseImg" border="0" src="search/close.png" alt=""/></a>
          </span>
        </div>
      </li>
    </ul>
  </div>
  <div id="navrow2" class="tabs2">
    <ul class="tablist">
      <li><a href="files.xhtml"><span>File&#160;List</span></a></li>
      <li><a href="globals.xhtml"><span>Globals</span></a></li>
    </ul>
  </div>
</div><!-- top -->
<div id="side-nav" class="ui-resizable side-nav-resizable">
  <div id="nav-tree">
    <div id="nav-tree-contents">
      <div id="nav-sync" class="sync"></div>
    </div>
  </div>
  <div id="splitbar" style="-moz-user-select:none;" 
       class="ui-resizable-handle">
  </div>
</div>
<script type="text/javascript">
$(document).ready(function(){initNavTree('harris__corners_8cl.xhtml','');});
</script>
<div id="doc-content">
<!-- window showing the filter options -->
<div id="MSearchSelectWindow"
     onmouseover="return searchBox.OnSearchSelectShow()"
     onmouseout="return searchBox.OnSearchSelectHide()"
     onkeydown="return searchBox.OnSearchSelectKey(event)">
<a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(0)"><span class="SelectionMark">&#160;</span>All</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(1)"><span class="SelectionMark">&#160;</span>Data Structures</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(2)"><span class="SelectionMark">&#160;</span>Namespaces</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(3)"><span class="SelectionMark">&#160;</span>Files</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(4)"><span class="SelectionMark">&#160;</span>Functions</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(5)"><span class="SelectionMark">&#160;</span>Variables</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(6)"><span class="SelectionMark">&#160;</span>Typedefs</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(7)"><span class="SelectionMark">&#160;</span>Enumerations</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(8)"><span class="SelectionMark">&#160;</span>Enumerator</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(9)"><span class="SelectionMark">&#160;</span>Friends</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(10)"><span class="SelectionMark">&#160;</span>Macros</a><a class="SelectItem" href="javascript:void(0)" onclick="searchBox.OnSelectItem(11)"><span class="SelectionMark">&#160;</span>Pages</a></div>

<!-- iframe showing the search results (closed by default) -->
<div id="MSearchResultsWindow">
<iframe src="javascript:void(0)" frameborder="0" 
        name="MSearchResults" id="MSearchResults">
</iframe>
</div>

<div class="header">
  <div class="summary">
<a href="#func-members">Functions</a>  </div>
  <div class="headertitle">
<div class="title">harris_corners.cl File Reference</div>  </div>
</div><!--header-->
<div class="contents">
<div class="textblock"><code>#include &quot;<a class="el" href="helpers_8h_source.xhtml">helpers.h</a>&quot;</code><br/>
</div>
<p><a href="harris__corners_8cl_source.xhtml">Go to the source code of this file.</a></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:a2cf3b8c23c9f8f383d81d13bfff96e3d"><td class="memItemLeft" align="right" valign="top">__kernel void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="harris__corners_8cl.xhtml#a2cf3b8c23c9f8f383d81d13bfff96e3d">harris_score_3x3</a> (__global uchar *src_gx_ptr, uint src_gx_stride_x, uint src_gx_step_x, uint src_gx_stride_y, uint src_gx_step_y, uint src_gx_offset_first_element_in_bytes, __global uchar *src_gy_ptr, uint src_gy_stride_x, uint src_gy_step_x, uint src_gy_stride_y, uint src_gy_step_y, uint src_gy_offset_first_element_in_bytes, __global uchar *vc_ptr, uint vc_stride_x, uint vc_step_x, uint vc_stride_y, uint vc_step_y, uint vc_offset_first_element_in_bytes, float sensitivity, float strength_thresh, float pow4_normalization_factor)</td></tr>
<tr class="memdesc:a2cf3b8c23c9f8f383d81d13bfff96e3d"><td class="mdescLeft">&#160;</td><td class="mdescRight">Function running harris score on 3x3 block size.  <a href="#a2cf3b8c23c9f8f383d81d13bfff96e3d">More...</a><br/></td></tr>
<tr class="separator:a2cf3b8c23c9f8f383d81d13bfff96e3d"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a71d10f5d9e840b6d270620a2cd856926"><td class="memItemLeft" align="right" valign="top">float16&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="harris__corners_8cl.xhtml#a71d10f5d9e840b6d270620a2cd856926">harris_score_1x5</a> (<a class="el" href="struct_image.xhtml">Image</a> *src_gx, <a class="el" href="struct_image.xhtml">Image</a> *src_gy, int row)</td></tr>
<tr class="memdesc:a71d10f5d9e840b6d270620a2cd856926"><td class="mdescLeft">&#160;</td><td class="mdescRight">Function for calculating harris score 1x5.  <a href="#a71d10f5d9e840b6d270620a2cd856926">More...</a><br/></td></tr>
<tr class="separator:a71d10f5d9e840b6d270620a2cd856926"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a0f0af2add0a40f2f4b8a14f409186a02"><td class="memItemLeft" align="right" valign="top">__kernel void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="harris__corners_8cl.xhtml#a0f0af2add0a40f2f4b8a14f409186a02">harris_score_5x5</a> (__global uchar *src_gx_ptr, uint src_gx_stride_x, uint src_gx_step_x, uint src_gx_stride_y, uint src_gx_step_y, uint src_gx_offset_first_element_in_bytes, __global uchar *src_gy_ptr, uint src_gy_stride_x, uint src_gy_step_x, uint src_gy_stride_y, uint src_gy_step_y, uint src_gy_offset_first_element_in_bytes, __global uchar *vc_ptr, uint vc_stride_x, uint vc_step_x, uint vc_stride_y, uint vc_step_y, uint vc_offset_first_element_in_bytes, float sensitivity, float strength_thresh, float pow4_normalization_factor)</td></tr>
<tr class="memdesc:a0f0af2add0a40f2f4b8a14f409186a02"><td class="mdescLeft">&#160;</td><td class="mdescRight">Function running harris score on 5x5 block size.  <a href="#a0f0af2add0a40f2f4b8a14f409186a02">More...</a><br/></td></tr>
<tr class="separator:a0f0af2add0a40f2f4b8a14f409186a02"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a2fadfd6378605824bb7926e1ac0123fb"><td class="memItemLeft" align="right" valign="top">float16&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="harris__corners_8cl.xhtml#a2fadfd6378605824bb7926e1ac0123fb">harris_score_1x7</a> (<a class="el" href="struct_image.xhtml">Image</a> *src_gx, <a class="el" href="struct_image.xhtml">Image</a> *src_gy, int row)</td></tr>
<tr class="memdesc:a2fadfd6378605824bb7926e1ac0123fb"><td class="mdescLeft">&#160;</td><td class="mdescRight">Function for calculating harris score 1x7.  <a href="#a2fadfd6378605824bb7926e1ac0123fb">More...</a><br/></td></tr>
<tr class="separator:a2fadfd6378605824bb7926e1ac0123fb"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:a468ac2728816485f017f51faeb0a7d65"><td class="memItemLeft" align="right" valign="top">__kernel void&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="harris__corners_8cl.xhtml#a468ac2728816485f017f51faeb0a7d65">harris_score_7x7</a> (__global uchar *src_gx_ptr, uint src_gx_stride_x, uint src_gx_step_x, uint src_gx_stride_y, uint src_gx_step_y, uint src_gx_offset_first_element_in_bytes, __global uchar *src_gy_ptr, uint src_gy_stride_x, uint src_gy_step_x, uint src_gy_stride_y, uint src_gy_step_y, uint src_gy_offset_first_element_in_bytes, __global uchar *vc_ptr, uint vc_stride_x, uint vc_step_x, uint vc_stride_y, uint vc_step_y, uint vc_offset_first_element_in_bytes, float sensitivity, float strength_thresh, float pow4_normalization_factor)</td></tr>
<tr class="memdesc:a468ac2728816485f017f51faeb0a7d65"><td class="mdescLeft">&#160;</td><td class="mdescRight">Function running harris score on 7x7 block size.  <a href="#a468ac2728816485f017f51faeb0a7d65">More...</a><br/></td></tr>
<tr class="separator:a468ac2728816485f017f51faeb0a7d65"><td class="memSeparator" colspan="2">&#160;</td></tr>
</table>
<h2 class="groupheader">Function Documentation</h2>
<a class="anchor" id="a71d10f5d9e840b6d270620a2cd856926"></a>
<div class="memitem">
<div class="memproto">
<table class="mlabels">
  <tr>
  <td class="mlabels-left">
      <table class="memname">
        <tr>
          <td class="memname">float16 harris_score_1x5 </td>
          <td>(</td>
          <td class="paramtype"><a class="el" href="struct_image.xhtml">Image</a> *&#160;</td>
          <td class="paramname"><em>src_gx</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype"><a class="el" href="struct_image.xhtml">Image</a> *&#160;</td>
          <td class="paramname"><em>src_gy</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">int&#160;</td>
          <td class="paramname"><em>row</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
        </tr>
      </table>
  </td>
  <td class="mlabels-right">
<span class="mlabels"><span class="mlabel">inline</span></span>  </td>
  </tr>
</table>
</div><div class="memdoc">

<p>Function for calculating harris score 1x5. </p>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramdir">[in]</td><td class="paramname">src_gx</td><td>Pointer to gx gradient image. </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src_gy</td><td>Pointer to gy gradient image. </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">row</td><td>Relative row. </td></tr>
  </table>
  </dd>
</dl>

<p>Definition at line <a class="el" href="harris__corners_8cl_source.xhtml#l00138">138</a> of file <a class="el" href="harris__corners_8cl_source.xhtml">harris_corners.cl</a>.</p>

<p>References <a class="el" href="convolution3x3_8cl_source.xhtml#l00027">DATA_TYPE</a>, <a class="el" href="helpers_8h_source.xhtml#l00295">offset()</a>, and <a class="el" href="fixed__point_8h_source.xhtml#l00093">VEC_DATA_TYPE</a>.</p>

<p>Referenced by <a class="el" href="harris__corners_8cl_source.xhtml#l00210">harris_score_5x5()</a>.</p>
<div class="fragment"><div class="line"><a name="l00139"></a><span class="lineno">  139</span>&#160;{</div>
<div class="line"><a name="l00140"></a><span class="lineno">  140</span>&#160;    float4 gx2  = 0.0f;</div>
<div class="line"><a name="l00141"></a><span class="lineno">  141</span>&#160;    float4 gy2  = 0.0f;</div>
<div class="line"><a name="l00142"></a><span class="lineno">  142</span>&#160;    float4 gxgy = 0.0f;</div>
<div class="line"><a name="l00143"></a><span class="lineno">  143</span>&#160;</div>
<div class="line"><a name="l00144"></a><span class="lineno">  144</span>&#160;    <span class="comment">/* Row */</span></div>
<div class="line"><a name="l00145"></a><span class="lineno">  145</span>&#160;    <a class="code" href="fixed__point_8h.xhtml#a36f754c05b6fddf6df0d8d0a74f8159f">VEC_DATA_TYPE</a>(<a class="code" href="convolution3x3_8cl.xhtml#afb8c72ce35c4a1f4a2588d6573e54aa1">DATA_TYPE</a>, 8)</div>
<div class="line"><a name="l00146"></a><span class="lineno">  146</span>&#160;    temp_gx = vload8(0, (__global <a class="code" href="convolution3x3_8cl.xhtml#afb8c72ce35c4a1f4a2588d6573e54aa1">DATA_TYPE</a> *)<a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>(src_gx, -2, row));</div>
<div class="line"><a name="l00147"></a><span class="lineno">  147</span>&#160;    <a class="code" href="fixed__point_8h.xhtml#a36f754c05b6fddf6df0d8d0a74f8159f">VEC_DATA_TYPE</a>(<a class="code" href="convolution3x3_8cl.xhtml#afb8c72ce35c4a1f4a2588d6573e54aa1">DATA_TYPE</a>, 8)</div>
<div class="line"><a name="l00148"></a><span class="lineno">  148</span>&#160;    temp_gy = vload8(0, (__global DATA_TYPE *)<a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>(src_gy, -2, row));</div>
<div class="line"><a name="l00149"></a><span class="lineno">  149</span>&#160;</div>
<div class="line"><a name="l00150"></a><span class="lineno">  150</span>&#160;    float4 gx = convert_float4(temp_gx.s0123);</div>
<div class="line"><a name="l00151"></a><span class="lineno">  151</span>&#160;    float4 gy = convert_float4(temp_gy.s0123);</div>
<div class="line"><a name="l00152"></a><span class="lineno">  152</span>&#160;    gx2 += (gx * gx);</div>
<div class="line"><a name="l00153"></a><span class="lineno">  153</span>&#160;    gy2 += (gy * gy);</div>
<div class="line"><a name="l00154"></a><span class="lineno">  154</span>&#160;    gxgy += (gx * gy);</div>
<div class="line"><a name="l00155"></a><span class="lineno">  155</span>&#160;</div>
<div class="line"><a name="l00156"></a><span class="lineno">  156</span>&#160;    gx = convert_float4(temp_gx.s1234);</div>
<div class="line"><a name="l00157"></a><span class="lineno">  157</span>&#160;    gy = convert_float4(temp_gy.s1234);</div>
<div class="line"><a name="l00158"></a><span class="lineno">  158</span>&#160;    gx2 += (gx * gx);</div>
<div class="line"><a name="l00159"></a><span class="lineno">  159</span>&#160;    gy2 += (gy * gy);</div>
<div class="line"><a name="l00160"></a><span class="lineno">  160</span>&#160;    gxgy += (gx * gy);</div>
<div class="line"><a name="l00161"></a><span class="lineno">  161</span>&#160;</div>
<div class="line"><a name="l00162"></a><span class="lineno">  162</span>&#160;    gx = convert_float4(temp_gx.s2345);</div>
<div class="line"><a name="l00163"></a><span class="lineno">  163</span>&#160;    gy = convert_float4(temp_gy.s2345);</div>
<div class="line"><a name="l00164"></a><span class="lineno">  164</span>&#160;    gx2 += (gx * gx);</div>
<div class="line"><a name="l00165"></a><span class="lineno">  165</span>&#160;    gy2 += (gy * gy);</div>
<div class="line"><a name="l00166"></a><span class="lineno">  166</span>&#160;    gxgy += (gx * gy);</div>
<div class="line"><a name="l00167"></a><span class="lineno">  167</span>&#160;</div>
<div class="line"><a name="l00168"></a><span class="lineno">  168</span>&#160;    gx = convert_float4(temp_gx.s3456);</div>
<div class="line"><a name="l00169"></a><span class="lineno">  169</span>&#160;    gy = convert_float4(temp_gy.s3456);</div>
<div class="line"><a name="l00170"></a><span class="lineno">  170</span>&#160;    gx2 += (gx * gx);</div>
<div class="line"><a name="l00171"></a><span class="lineno">  171</span>&#160;    gy2 += (gy * gy);</div>
<div class="line"><a name="l00172"></a><span class="lineno">  172</span>&#160;    gxgy += (gx * gy);</div>
<div class="line"><a name="l00173"></a><span class="lineno">  173</span>&#160;</div>
<div class="line"><a name="l00174"></a><span class="lineno">  174</span>&#160;    gx = convert_float4(temp_gx.s4567);</div>
<div class="line"><a name="l00175"></a><span class="lineno">  175</span>&#160;    gy = convert_float4(temp_gy.s4567);</div>
<div class="line"><a name="l00176"></a><span class="lineno">  176</span>&#160;    gx2 += (gx * gx);</div>
<div class="line"><a name="l00177"></a><span class="lineno">  177</span>&#160;    gy2 += (gy * gy);</div>
<div class="line"><a name="l00178"></a><span class="lineno">  178</span>&#160;    gxgy += (gx * gy);</div>
<div class="line"><a name="l00179"></a><span class="lineno">  179</span>&#160;</div>
<div class="line"><a name="l00180"></a><span class="lineno">  180</span>&#160;    return (float16)(gx2, gy2, gxgy, (float4)0);</div>
<div class="line"><a name="l00181"></a><span class="lineno">  181</span>&#160;}</div>
<div class="ttc" id="convolution3x3_8cl_xhtml_afb8c72ce35c4a1f4a2588d6573e54aa1"><div class="ttname"><a href="convolution3x3_8cl.xhtml#afb8c72ce35c4a1f4a2588d6573e54aa1">DATA_TYPE</a></div><div class="ttdeci">#define DATA_TYPE</div><div class="ttdef"><b>Definition:</b> <a href="convolution3x3_8cl_source.xhtml#l00027">convolution3x3.cl:27</a></div></div>
<div class="ttc" id="helpers_8h_xhtml_a009469e4d9b8fce3b6d5e97d2077827d"><div class="ttname"><a href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a></div><div class="ttdeci">__global uchar * offset(const Image *img, int x, int y)</div><div class="ttdoc">Get the pointer position of a Image. </div><div class="ttdef"><b>Definition:</b> <a href="helpers_8h_source.xhtml#l00295">helpers.h:295</a></div></div>
<div class="ttc" id="fixed__point_8h_xhtml_a36f754c05b6fddf6df0d8d0a74f8159f"><div class="ttname"><a href="fixed__point_8h.xhtml#a36f754c05b6fddf6df0d8d0a74f8159f">VEC_DATA_TYPE</a></div><div class="ttdeci">#define VEC_DATA_TYPE(type, size)</div><div class="ttdef"><b>Definition:</b> <a href="fixed__point_8h_source.xhtml#l00093">fixed_point.h:93</a></div></div>
</div><!-- fragment -->
</div>
</div>
<a class="anchor" id="a2fadfd6378605824bb7926e1ac0123fb"></a>
<div class="memitem">
<div class="memproto">
<table class="mlabels">
  <tr>
  <td class="mlabels-left">
      <table class="memname">
        <tr>
          <td class="memname">float16 harris_score_1x7 </td>
          <td>(</td>
          <td class="paramtype"><a class="el" href="struct_image.xhtml">Image</a> *&#160;</td>
          <td class="paramname"><em>src_gx</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype"><a class="el" href="struct_image.xhtml">Image</a> *&#160;</td>
          <td class="paramname"><em>src_gy</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">int&#160;</td>
          <td class="paramname"><em>row</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
        </tr>
      </table>
  </td>
  <td class="mlabels-right">
<span class="mlabels"><span class="mlabel">inline</span></span>  </td>
  </tr>
</table>
</div><div class="memdoc">

<p>Function for calculating harris score 1x7. </p>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramdir">[in]</td><td class="paramname">src_gx</td><td>Pointer to gx gradient image. </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src_gy</td><td>Pointer to gy gradient image. </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">row</td><td>Relative row. </td></tr>
  </table>
  </dd>
</dl>

<p>Definition at line <a class="el" href="harris__corners_8cl_source.xhtml#l00253">253</a> of file <a class="el" href="harris__corners_8cl_source.xhtml">harris_corners.cl</a>.</p>

<p>References <a class="el" href="convolution3x3_8cl_source.xhtml#l00027">DATA_TYPE</a>, <a class="el" href="helpers_8h_source.xhtml#l00295">offset()</a>, and <a class="el" href="fixed__point_8h_source.xhtml#l00093">VEC_DATA_TYPE</a>.</p>

<p>Referenced by <a class="el" href="harris__corners_8cl_source.xhtml#l00341">harris_score_7x7()</a>.</p>
<div class="fragment"><div class="line"><a name="l00254"></a><span class="lineno">  254</span>&#160;{</div>
<div class="line"><a name="l00255"></a><span class="lineno">  255</span>&#160;    float4 gx2  = 0.0f;</div>
<div class="line"><a name="l00256"></a><span class="lineno">  256</span>&#160;    float4 gy2  = 0.0f;</div>
<div class="line"><a name="l00257"></a><span class="lineno">  257</span>&#160;    float4 gxgy = 0.0f;</div>
<div class="line"><a name="l00258"></a><span class="lineno">  258</span>&#160;</div>
<div class="line"><a name="l00259"></a><span class="lineno">  259</span>&#160;    <span class="comment">/* Row */</span></div>
<div class="line"><a name="l00260"></a><span class="lineno">  260</span>&#160;    <a class="code" href="fixed__point_8h.xhtml#a36f754c05b6fddf6df0d8d0a74f8159f">VEC_DATA_TYPE</a>(<a class="code" href="convolution3x3_8cl.xhtml#afb8c72ce35c4a1f4a2588d6573e54aa1">DATA_TYPE</a>, 8)</div>
<div class="line"><a name="l00261"></a><span class="lineno">  261</span>&#160;    temp_gx0 = vload8(0, (__global <a class="code" href="convolution3x3_8cl.xhtml#afb8c72ce35c4a1f4a2588d6573e54aa1">DATA_TYPE</a> *)<a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>(src_gx, -3, row));</div>
<div class="line"><a name="l00262"></a><span class="lineno">  262</span>&#160;    <a class="code" href="fixed__point_8h.xhtml#a36f754c05b6fddf6df0d8d0a74f8159f">VEC_DATA_TYPE</a>(<a class="code" href="convolution3x3_8cl.xhtml#afb8c72ce35c4a1f4a2588d6573e54aa1">DATA_TYPE</a>, 8)</div>
<div class="line"><a name="l00263"></a><span class="lineno">  263</span>&#160;    temp_gy0 = vload8(0, (__global DATA_TYPE *)<a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>(src_gy, -3, row));</div>
<div class="line"><a name="l00264"></a><span class="lineno">  264</span>&#160;    <a class="code" href="fixed__point_8h.xhtml#a36f754c05b6fddf6df0d8d0a74f8159f">VEC_DATA_TYPE</a>(DATA_TYPE, 2)</div>
<div class="line"><a name="l00265"></a><span class="lineno">  265</span>&#160;    temp_gx1 = vload2(0, (__global DATA_TYPE *)<a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>(src_gx, 5, row));</div>
<div class="line"><a name="l00266"></a><span class="lineno">  266</span>&#160;    <a class="code" href="fixed__point_8h.xhtml#a36f754c05b6fddf6df0d8d0a74f8159f">VEC_DATA_TYPE</a>(DATA_TYPE, 2)</div>
<div class="line"><a name="l00267"></a><span class="lineno">  267</span>&#160;    temp_gy1 = vload2(0, (__global DATA_TYPE *)<a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>(src_gy, 5, row));</div>
<div class="line"><a name="l00268"></a><span class="lineno">  268</span>&#160;</div>
<div class="line"><a name="l00269"></a><span class="lineno">  269</span>&#160;    float4 gx = convert_float4(temp_gx0.s0123);</div>
<div class="line"><a name="l00270"></a><span class="lineno">  270</span>&#160;    float4 gy = convert_float4(temp_gy0.s0123);</div>
<div class="line"><a name="l00271"></a><span class="lineno">  271</span>&#160;    gx2 += (gx * gx);</div>
<div class="line"><a name="l00272"></a><span class="lineno">  272</span>&#160;    gy2 += (gy * gy);</div>
<div class="line"><a name="l00273"></a><span class="lineno">  273</span>&#160;    gxgy += (gx * gy);</div>
<div class="line"><a name="l00274"></a><span class="lineno">  274</span>&#160;</div>
<div class="line"><a name="l00275"></a><span class="lineno">  275</span>&#160;    gx = convert_float4(temp_gx0.s1234);</div>
<div class="line"><a name="l00276"></a><span class="lineno">  276</span>&#160;    gy = convert_float4(temp_gy0.s1234);</div>
<div class="line"><a name="l00277"></a><span class="lineno">  277</span>&#160;    gx2 += (gx * gx);</div>
<div class="line"><a name="l00278"></a><span class="lineno">  278</span>&#160;    gy2 += (gy * gy);</div>
<div class="line"><a name="l00279"></a><span class="lineno">  279</span>&#160;    gxgy += (gx * gy);</div>
<div class="line"><a name="l00280"></a><span class="lineno">  280</span>&#160;</div>
<div class="line"><a name="l00281"></a><span class="lineno">  281</span>&#160;    gx = convert_float4(temp_gx0.s2345);</div>
<div class="line"><a name="l00282"></a><span class="lineno">  282</span>&#160;    gy = convert_float4(temp_gy0.s2345);</div>
<div class="line"><a name="l00283"></a><span class="lineno">  283</span>&#160;    gx2 += (gx * gx);</div>
<div class="line"><a name="l00284"></a><span class="lineno">  284</span>&#160;    gy2 += (gy * gy);</div>
<div class="line"><a name="l00285"></a><span class="lineno">  285</span>&#160;    gxgy += (gx * gy);</div>
<div class="line"><a name="l00286"></a><span class="lineno">  286</span>&#160;</div>
<div class="line"><a name="l00287"></a><span class="lineno">  287</span>&#160;    gx = convert_float4(temp_gx0.s3456);</div>
<div class="line"><a name="l00288"></a><span class="lineno">  288</span>&#160;    gy = convert_float4(temp_gy0.s3456);</div>
<div class="line"><a name="l00289"></a><span class="lineno">  289</span>&#160;    gx2 += (gx * gx);</div>
<div class="line"><a name="l00290"></a><span class="lineno">  290</span>&#160;    gy2 += (gy * gy);</div>
<div class="line"><a name="l00291"></a><span class="lineno">  291</span>&#160;    gxgy += (gx * gy);</div>
<div class="line"><a name="l00292"></a><span class="lineno">  292</span>&#160;</div>
<div class="line"><a name="l00293"></a><span class="lineno">  293</span>&#160;    gx = convert_float4(temp_gx0.s4567);</div>
<div class="line"><a name="l00294"></a><span class="lineno">  294</span>&#160;    gy = convert_float4(temp_gy0.s4567);</div>
<div class="line"><a name="l00295"></a><span class="lineno">  295</span>&#160;    gx2 += (gx * gx);</div>
<div class="line"><a name="l00296"></a><span class="lineno">  296</span>&#160;    gy2 += (gy * gy);</div>
<div class="line"><a name="l00297"></a><span class="lineno">  297</span>&#160;    gxgy += (gx * gy);</div>
<div class="line"><a name="l00298"></a><span class="lineno">  298</span>&#160;</div>
<div class="line"><a name="l00299"></a><span class="lineno">  299</span>&#160;    gx = convert_float4((<a class="code" href="fixed__point_8h.xhtml#a36f754c05b6fddf6df0d8d0a74f8159f">VEC_DATA_TYPE</a>(DATA_TYPE, 4))(temp_gx0.s567, temp_gx1.s0));</div>
<div class="line"><a name="l00300"></a><span class="lineno">  300</span>&#160;    gy = convert_float4((<a class="code" href="fixed__point_8h.xhtml#a36f754c05b6fddf6df0d8d0a74f8159f">VEC_DATA_TYPE</a>(DATA_TYPE, 4))(temp_gy0.s567, temp_gy1.s0));</div>
<div class="line"><a name="l00301"></a><span class="lineno">  301</span>&#160;    gx2 += (gx * gx);</div>
<div class="line"><a name="l00302"></a><span class="lineno">  302</span>&#160;    gy2 += (gy * gy);</div>
<div class="line"><a name="l00303"></a><span class="lineno">  303</span>&#160;    gxgy += (gx * gy);</div>
<div class="line"><a name="l00304"></a><span class="lineno">  304</span>&#160;</div>
<div class="line"><a name="l00305"></a><span class="lineno">  305</span>&#160;    gx = convert_float4((<a class="code" href="fixed__point_8h.xhtml#a36f754c05b6fddf6df0d8d0a74f8159f">VEC_DATA_TYPE</a>(DATA_TYPE, 4))(temp_gx0.s67, temp_gx1.s01));</div>
<div class="line"><a name="l00306"></a><span class="lineno">  306</span>&#160;    gy = convert_float4((<a class="code" href="fixed__point_8h.xhtml#a36f754c05b6fddf6df0d8d0a74f8159f">VEC_DATA_TYPE</a>(DATA_TYPE, 4))(temp_gy0.s67, temp_gy1.s01));</div>
<div class="line"><a name="l00307"></a><span class="lineno">  307</span>&#160;    gx2 += (gx * gx);</div>
<div class="line"><a name="l00308"></a><span class="lineno">  308</span>&#160;    gy2 += (gy * gy);</div>
<div class="line"><a name="l00309"></a><span class="lineno">  309</span>&#160;    gxgy += (gx * gy);</div>
<div class="line"><a name="l00310"></a><span class="lineno">  310</span>&#160;</div>
<div class="line"><a name="l00311"></a><span class="lineno">  311</span>&#160;    return (float16)(gx2, gy2, gxgy, (float4)0);</div>
<div class="line"><a name="l00312"></a><span class="lineno">  312</span>&#160;}</div>
<div class="ttc" id="convolution3x3_8cl_xhtml_afb8c72ce35c4a1f4a2588d6573e54aa1"><div class="ttname"><a href="convolution3x3_8cl.xhtml#afb8c72ce35c4a1f4a2588d6573e54aa1">DATA_TYPE</a></div><div class="ttdeci">#define DATA_TYPE</div><div class="ttdef"><b>Definition:</b> <a href="convolution3x3_8cl_source.xhtml#l00027">convolution3x3.cl:27</a></div></div>
<div class="ttc" id="helpers_8h_xhtml_a009469e4d9b8fce3b6d5e97d2077827d"><div class="ttname"><a href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a></div><div class="ttdeci">__global uchar * offset(const Image *img, int x, int y)</div><div class="ttdoc">Get the pointer position of a Image. </div><div class="ttdef"><b>Definition:</b> <a href="helpers_8h_source.xhtml#l00295">helpers.h:295</a></div></div>
<div class="ttc" id="fixed__point_8h_xhtml_a36f754c05b6fddf6df0d8d0a74f8159f"><div class="ttname"><a href="fixed__point_8h.xhtml#a36f754c05b6fddf6df0d8d0a74f8159f">VEC_DATA_TYPE</a></div><div class="ttdeci">#define VEC_DATA_TYPE(type, size)</div><div class="ttdef"><b>Definition:</b> <a href="fixed__point_8h_source.xhtml#l00093">fixed_point.h:93</a></div></div>
</div><!-- fragment -->
</div>
</div>
<a class="anchor" id="a2cf3b8c23c9f8f383d81d13bfff96e3d"></a>
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">__kernel void harris_score_3x3 </td>
          <td>(</td>
          <td class="paramtype">__global uchar *&#160;</td>
          <td class="paramname"><em>src_gx_ptr</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src_gx_stride_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src_gx_step_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src_gx_stride_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src_gx_step_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src_gx_offset_first_element_in_bytes</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">__global uchar *&#160;</td>
          <td class="paramname"><em>src_gy_ptr</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src_gy_stride_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src_gy_step_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src_gy_stride_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src_gy_step_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src_gy_offset_first_element_in_bytes</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">__global uchar *&#160;</td>
          <td class="paramname"><em>vc_ptr</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>vc_stride_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>vc_step_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>vc_stride_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>vc_step_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>vc_offset_first_element_in_bytes</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">float&#160;</td>
          <td class="paramname"><em>sensitivity</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">float&#160;</td>
          <td class="paramname"><em>strength_thresh</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">float&#160;</td>
          <td class="paramname"><em>pow4_normalization_factor</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
        </tr>
      </table>
</div><div class="memdoc">

<p>Function running harris score on 3x3 block size. </p>
<dl class="section attention"><dt>Attention</dt><dd>: The input data type should be passed using a compile option -DDATA_TYPE. Supported types: short and int. e.g. -DDATA_TYPE=short.</dd></dl>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramdir">[in]</td><td class="paramname">src_gx_ptr</td><td>Pointer to the first source image. Supported data types: S16, S32 </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src_gx_stride_x</td><td>Stride of the source image in X dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src_gx_step_x</td><td>src_gx_stride_x * number of elements along X processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src_gx_stride_y</td><td>Stride of the source image in Y dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src_gx_step_y</td><td>src_gx_stride_y * number of elements along Y processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src_gx_offset_first_element_in_bytes</td><td>The offset of the first element in the source image </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src_gy_ptr</td><td>Pointer to the second source image. Supported data types: S16, S32 </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src_gy_stride_x</td><td>Stride of the destination image in X dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src_gy_step_x</td><td>src_gy_stride_x * number of elements along X processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src_gy_stride_y</td><td>Stride of the destination image in Y dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src_gy_step_y</td><td>src_gy_stride_y * number of elements along Y processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src_gy_offset_first_element_in_bytes</td><td>The offset of the first element in the destination image </td></tr>
    <tr><td class="paramdir">[out]</td><td class="paramname">vc_ptr</td><td>Pointer to the destination image. Supported data types: F32 </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">vc_stride_x</td><td>Stride of the destination image in X dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">vc_step_x</td><td>vc_stride_x * number of elements along X processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">vc_stride_y</td><td>Stride of the destination image in Y dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">vc_step_y</td><td>vc_stride_y * number of elements along Y processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">vc_offset_first_element_in_bytes</td><td>The offset of the first element in the destination image </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">sensitivity</td><td>Sensitivity threshold k from the Harris-Stephens equation </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">strength_thresh</td><td>Minimum threshold with which to eliminate Harris Corner scores </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">pow4_normalization_factor</td><td>Normalization factor to apply harris score </td></tr>
  </table>
  </dd>
</dl>

<p>Definition at line <a class="el" href="harris__corners_8cl_source.xhtml#l00053">53</a> of file <a class="el" href="harris__corners_8cl_source.xhtml">harris_corners.cl</a>.</p>

<p>References <a class="el" href="helpers_8h_source.xhtml#l00096">CONVERT_TO_IMAGE_STRUCT</a>, <a class="el" href="convolution3x3_8cl_source.xhtml#l00027">DATA_TYPE</a>, <a class="el" href="helpers_8h_source.xhtml#l00295">offset()</a>, <a class="el" href="helpers_8h_source.xhtml#l00136">Image::ptr</a>, and <a class="el" href="fixed__point_8h_source.xhtml#l00093">VEC_DATA_TYPE</a>.</p>
<div class="fragment"><div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;{</div>
<div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;    <a class="code" href="struct_image.xhtml">Image</a> src_gx = <a class="code" href="helpers_8h.xhtml#aebe814363556c244be043b13e7969197">CONVERT_TO_IMAGE_STRUCT</a>(src_gx);</div>
<div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;    <a class="code" href="struct_image.xhtml">Image</a> src_gy = <a class="code" href="helpers_8h.xhtml#aebe814363556c244be043b13e7969197">CONVERT_TO_IMAGE_STRUCT</a>(src_gy);</div>
<div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;    <a class="code" href="struct_image.xhtml">Image</a> vc     = <a class="code" href="helpers_8h.xhtml#aebe814363556c244be043b13e7969197">CONVERT_TO_IMAGE_STRUCT</a>(vc);</div>
<div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;</div>
<div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;    <span class="comment">/* Gx^2, Gy^2 and Gx*Gy */</span></div>
<div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;    float4 gx2  = (float4)0.0f;</div>
<div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;    float4 gy2  = (float4)0.0f;</div>
<div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;    float4 gxgy = (float4)0.0f;</div>
<div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;</div>
<div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;    <span class="comment">/* Row0 */</span></div>
<div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;    <a class="code" href="fixed__point_8h.xhtml#a36f754c05b6fddf6df0d8d0a74f8159f">VEC_DATA_TYPE</a>(<a class="code" href="convolution3x3_8cl.xhtml#afb8c72ce35c4a1f4a2588d6573e54aa1">DATA_TYPE</a>, 8)</div>
<div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;    temp_gx = vload8(0, (__global <a class="code" href="convolution3x3_8cl.xhtml#afb8c72ce35c4a1f4a2588d6573e54aa1">DATA_TYPE</a> *)<a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>(&amp;src_gx, -1, -1));</div>
<div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;    <a class="code" href="fixed__point_8h.xhtml#a36f754c05b6fddf6df0d8d0a74f8159f">VEC_DATA_TYPE</a>(<a class="code" href="convolution3x3_8cl.xhtml#afb8c72ce35c4a1f4a2588d6573e54aa1">DATA_TYPE</a>, 8)</div>
<div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;    temp_gy = vload8(0, (__global DATA_TYPE *)<a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>(&amp;src_gy, -1, -1));</div>
<div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;</div>
<div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;    float4 l_gx = convert_float4(temp_gx.s0123);</div>
<div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;    float4 m_gx = convert_float4(temp_gx.s1234);</div>
<div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;    float4 r_gx = convert_float4(temp_gx.s2345);</div>
<div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;</div>
<div class="line"><a name="l00080"></a><span class="lineno">   80</span>&#160;    float4 l_gy = convert_float4(temp_gy.s0123);</div>
<div class="line"><a name="l00081"></a><span class="lineno">   81</span>&#160;    float4 m_gy = convert_float4(temp_gy.s1234);</div>
<div class="line"><a name="l00082"></a><span class="lineno">   82</span>&#160;    float4 r_gy = convert_float4(temp_gy.s2345);</div>
<div class="line"><a name="l00083"></a><span class="lineno">   83</span>&#160;</div>
<div class="line"><a name="l00084"></a><span class="lineno">   84</span>&#160;    gx2 += (l_gx * l_gx) + (m_gx * m_gx) + (r_gx * r_gx);</div>
<div class="line"><a name="l00085"></a><span class="lineno">   85</span>&#160;    gy2 += (l_gy * l_gy) + (m_gy * m_gy) + (r_gy * r_gy);</div>
<div class="line"><a name="l00086"></a><span class="lineno">   86</span>&#160;    gxgy += (l_gx * l_gy) + (m_gx * m_gy) + (r_gx * r_gy);</div>
<div class="line"><a name="l00087"></a><span class="lineno">   87</span>&#160;</div>
<div class="line"><a name="l00088"></a><span class="lineno">   88</span>&#160;    <span class="comment">/* Row1 */</span></div>
<div class="line"><a name="l00089"></a><span class="lineno">   89</span>&#160;    temp_gx = vload8(0, (__global DATA_TYPE *)<a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>(&amp;src_gx, -1, 0));</div>
<div class="line"><a name="l00090"></a><span class="lineno">   90</span>&#160;    temp_gy = vload8(0, (__global DATA_TYPE *)<a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>(&amp;src_gy, -1, 0));</div>
<div class="line"><a name="l00091"></a><span class="lineno">   91</span>&#160;</div>
<div class="line"><a name="l00092"></a><span class="lineno">   92</span>&#160;    l_gx = convert_float4(temp_gx.s0123);</div>
<div class="line"><a name="l00093"></a><span class="lineno">   93</span>&#160;    m_gx = convert_float4(temp_gx.s1234);</div>
<div class="line"><a name="l00094"></a><span class="lineno">   94</span>&#160;    r_gx = convert_float4(temp_gx.s2345);</div>
<div class="line"><a name="l00095"></a><span class="lineno">   95</span>&#160;</div>
<div class="line"><a name="l00096"></a><span class="lineno">   96</span>&#160;    l_gy = convert_float4(temp_gy.s0123);</div>
<div class="line"><a name="l00097"></a><span class="lineno">   97</span>&#160;    m_gy = convert_float4(temp_gy.s1234);</div>
<div class="line"><a name="l00098"></a><span class="lineno">   98</span>&#160;    r_gy = convert_float4(temp_gy.s2345);</div>
<div class="line"><a name="l00099"></a><span class="lineno">   99</span>&#160;</div>
<div class="line"><a name="l00100"></a><span class="lineno">  100</span>&#160;    gx2 += (l_gx * l_gx) + (m_gx * m_gx) + (r_gx * r_gx);</div>
<div class="line"><a name="l00101"></a><span class="lineno">  101</span>&#160;    gy2 += (l_gy * l_gy) + (m_gy * m_gy) + (r_gy * r_gy);</div>
<div class="line"><a name="l00102"></a><span class="lineno">  102</span>&#160;    gxgy += (l_gx * l_gy) + (m_gx * m_gy) + (r_gx * r_gy);</div>
<div class="line"><a name="l00103"></a><span class="lineno">  103</span>&#160;</div>
<div class="line"><a name="l00104"></a><span class="lineno">  104</span>&#160;    <span class="comment">/* Row2 */</span></div>
<div class="line"><a name="l00105"></a><span class="lineno">  105</span>&#160;    temp_gx = vload8(0, (__global DATA_TYPE *)<a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>(&amp;src_gx, -1, 1));</div>
<div class="line"><a name="l00106"></a><span class="lineno">  106</span>&#160;    temp_gy = vload8(0, (__global DATA_TYPE *)<a class="code" href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a>(&amp;src_gy, -1, 1));</div>
<div class="line"><a name="l00107"></a><span class="lineno">  107</span>&#160;</div>
<div class="line"><a name="l00108"></a><span class="lineno">  108</span>&#160;    l_gx = convert_float4(temp_gx.s0123);</div>
<div class="line"><a name="l00109"></a><span class="lineno">  109</span>&#160;    m_gx = convert_float4(temp_gx.s1234);</div>
<div class="line"><a name="l00110"></a><span class="lineno">  110</span>&#160;    r_gx = convert_float4(temp_gx.s2345);</div>
<div class="line"><a name="l00111"></a><span class="lineno">  111</span>&#160;</div>
<div class="line"><a name="l00112"></a><span class="lineno">  112</span>&#160;    l_gy = convert_float4(temp_gy.s0123);</div>
<div class="line"><a name="l00113"></a><span class="lineno">  113</span>&#160;    m_gy = convert_float4(temp_gy.s1234);</div>
<div class="line"><a name="l00114"></a><span class="lineno">  114</span>&#160;    r_gy = convert_float4(temp_gy.s2345);</div>
<div class="line"><a name="l00115"></a><span class="lineno">  115</span>&#160;</div>
<div class="line"><a name="l00116"></a><span class="lineno">  116</span>&#160;    gx2 += (l_gx * l_gx) + (m_gx * m_gx) + (r_gx * r_gx);</div>
<div class="line"><a name="l00117"></a><span class="lineno">  117</span>&#160;    gy2 += (l_gy * l_gy) + (m_gy * m_gy) + (r_gy * r_gy);</div>
<div class="line"><a name="l00118"></a><span class="lineno">  118</span>&#160;    gxgy += (l_gx * l_gy) + (m_gx * m_gy) + (r_gx * r_gy);</div>
<div class="line"><a name="l00119"></a><span class="lineno">  119</span>&#160;</div>
<div class="line"><a name="l00120"></a><span class="lineno">  120</span>&#160;    <span class="comment">/* Compute trace and determinant */</span></div>
<div class="line"><a name="l00121"></a><span class="lineno">  121</span>&#160;    float4 trace = gx2 + gy2;</div>
<div class="line"><a name="l00122"></a><span class="lineno">  122</span>&#160;    float4 det   = gx2 * gy2 - (gxgy * gxgy);</div>
<div class="line"><a name="l00123"></a><span class="lineno">  123</span>&#160;</div>
<div class="line"><a name="l00124"></a><span class="lineno">  124</span>&#160;    <span class="comment">/* Compute harris score */</span></div>
<div class="line"><a name="l00125"></a><span class="lineno">  125</span>&#160;    float4 mc = (det - (sensitivity * (trace * trace))) * pow4_normalization_factor;</div>
<div class="line"><a name="l00126"></a><span class="lineno">  126</span>&#160;</div>
<div class="line"><a name="l00127"></a><span class="lineno">  127</span>&#160;    mc = select(0.0f, mc, mc &gt; (float4)strength_thresh);</div>
<div class="line"><a name="l00128"></a><span class="lineno">  128</span>&#160;</div>
<div class="line"><a name="l00129"></a><span class="lineno">  129</span>&#160;    vstore4(mc, 0, (__global <span class="keywordtype">float</span> *)vc.ptr);</div>
<div class="line"><a name="l00130"></a><span class="lineno">  130</span>&#160;}</div>
<div class="ttc" id="convolution3x3_8cl_xhtml_afb8c72ce35c4a1f4a2588d6573e54aa1"><div class="ttname"><a href="convolution3x3_8cl.xhtml#afb8c72ce35c4a1f4a2588d6573e54aa1">DATA_TYPE</a></div><div class="ttdeci">#define DATA_TYPE</div><div class="ttdef"><b>Definition:</b> <a href="convolution3x3_8cl_source.xhtml#l00027">convolution3x3.cl:27</a></div></div>
<div class="ttc" id="helpers_8h_xhtml_a009469e4d9b8fce3b6d5e97d2077827d"><div class="ttname"><a href="helpers_8h.xhtml#a009469e4d9b8fce3b6d5e97d2077827d">offset</a></div><div class="ttdeci">__global uchar * offset(const Image *img, int x, int y)</div><div class="ttdoc">Get the pointer position of a Image. </div><div class="ttdef"><b>Definition:</b> <a href="helpers_8h_source.xhtml#l00295">helpers.h:295</a></div></div>
<div class="ttc" id="helpers_8h_xhtml_aebe814363556c244be043b13e7969197"><div class="ttname"><a href="helpers_8h.xhtml#aebe814363556c244be043b13e7969197">CONVERT_TO_IMAGE_STRUCT</a></div><div class="ttdeci">#define CONVERT_TO_IMAGE_STRUCT(name)</div><div class="ttdef"><b>Definition:</b> <a href="helpers_8h_source.xhtml#l00096">helpers.h:96</a></div></div>
<div class="ttc" id="struct_image_xhtml"><div class="ttname"><a href="struct_image.xhtml">Image</a></div><div class="ttdoc">Structure to hold Image information. </div><div class="ttdef"><b>Definition:</b> <a href="helpers_8h_source.xhtml#l00134">helpers.h:134</a></div></div>
<div class="ttc" id="fixed__point_8h_xhtml_a36f754c05b6fddf6df0d8d0a74f8159f"><div class="ttname"><a href="fixed__point_8h.xhtml#a36f754c05b6fddf6df0d8d0a74f8159f">VEC_DATA_TYPE</a></div><div class="ttdeci">#define VEC_DATA_TYPE(type, size)</div><div class="ttdef"><b>Definition:</b> <a href="fixed__point_8h_source.xhtml#l00093">fixed_point.h:93</a></div></div>
</div><!-- fragment -->
</div>
</div>
<a class="anchor" id="a0f0af2add0a40f2f4b8a14f409186a02"></a>
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">__kernel void harris_score_5x5 </td>
          <td>(</td>
          <td class="paramtype">__global uchar *&#160;</td>
          <td class="paramname"><em>src_gx_ptr</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src_gx_stride_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src_gx_step_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src_gx_stride_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src_gx_step_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src_gx_offset_first_element_in_bytes</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">__global uchar *&#160;</td>
          <td class="paramname"><em>src_gy_ptr</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src_gy_stride_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src_gy_step_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src_gy_stride_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src_gy_step_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src_gy_offset_first_element_in_bytes</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">__global uchar *&#160;</td>
          <td class="paramname"><em>vc_ptr</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>vc_stride_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>vc_step_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>vc_stride_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>vc_step_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>vc_offset_first_element_in_bytes</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">float&#160;</td>
          <td class="paramname"><em>sensitivity</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">float&#160;</td>
          <td class="paramname"><em>strength_thresh</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">float&#160;</td>
          <td class="paramname"><em>pow4_normalization_factor</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
        </tr>
      </table>
</div><div class="memdoc">

<p>Function running harris score on 5x5 block size. </p>
<dl class="section attention"><dt>Attention</dt><dd>: The input data type should be passed using a compile option -DDATA_TYPE. Supported types: short and int. e.g. -DDATA_TYPE=short.</dd></dl>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramdir">[in]</td><td class="paramname">src_gx_ptr</td><td>Pointer to the first source image. Supported data types: S16, S32 </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src_gx_stride_x</td><td>Stride of the source image in X dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src_gx_step_x</td><td>src_gx_stride_x * number of elements along X processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src_gx_stride_y</td><td>Stride of the source image in Y dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src_gx_step_y</td><td>src_gx_stride_y * number of elements along Y processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src_gx_offset_first_element_in_bytes</td><td>The offset of the first element in the source image </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src_gy_ptr</td><td>Pointer to the second source image. Supported data types: S16, S32 </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src_gy_stride_x</td><td>Stride of the destination image in X dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src_gy_step_x</td><td>src_gy_stride_x * number of elements along X processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src_gy_stride_y</td><td>Stride of the destination image in Y dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src_gy_step_y</td><td>src_gy_stride_y * number of elements along Y processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src_gy_offset_first_element_in_bytes</td><td>The offset of the first element in the destination image </td></tr>
    <tr><td class="paramdir">[out]</td><td class="paramname">vc_ptr</td><td>Pointer to the destination image. Supported data types: F32 </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">vc_stride_x</td><td>Stride of the destination image in X dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">vc_step_x</td><td>vc_stride_x * number of elements along X processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">vc_stride_y</td><td>Stride of the destination image in Y dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">vc_step_y</td><td>vc_stride_y * number of elements along Y processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">vc_offset_first_element_in_bytes</td><td>The offset of the first element in the destination image </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">sensitivity</td><td>Sensitivity threshold k from the Harris-Stephens equation </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">strength_thresh</td><td>Minimum threshold with which to eliminate Harris Corner scores </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">pow4_normalization_factor</td><td>Normalization factor to apply harris score </td></tr>
  </table>
  </dd>
</dl>

<p>Definition at line <a class="el" href="harris__corners_8cl_source.xhtml#l00210">210</a> of file <a class="el" href="harris__corners_8cl_source.xhtml">harris_corners.cl</a>.</p>

<p>References <a class="el" href="helpers_8h_source.xhtml#l00096">CONVERT_TO_IMAGE_STRUCT</a>, <a class="el" href="harris__corners_8cl_source.xhtml#l00138">harris_score_1x5()</a>, and <a class="el" href="helpers_8h_source.xhtml#l00136">Image::ptr</a>.</p>
<div class="fragment"><div class="line"><a name="l00217"></a><span class="lineno">  217</span>&#160;{</div>
<div class="line"><a name="l00218"></a><span class="lineno">  218</span>&#160;    <a class="code" href="struct_image.xhtml">Image</a> src_gx = <a class="code" href="helpers_8h.xhtml#aebe814363556c244be043b13e7969197">CONVERT_TO_IMAGE_STRUCT</a>(src_gx);</div>
<div class="line"><a name="l00219"></a><span class="lineno">  219</span>&#160;    <a class="code" href="struct_image.xhtml">Image</a> src_gy = <a class="code" href="helpers_8h.xhtml#aebe814363556c244be043b13e7969197">CONVERT_TO_IMAGE_STRUCT</a>(src_gy);</div>
<div class="line"><a name="l00220"></a><span class="lineno">  220</span>&#160;    <a class="code" href="struct_image.xhtml">Image</a> vc     = <a class="code" href="helpers_8h.xhtml#aebe814363556c244be043b13e7969197">CONVERT_TO_IMAGE_STRUCT</a>(vc);</div>
<div class="line"><a name="l00221"></a><span class="lineno">  221</span>&#160;</div>
<div class="line"><a name="l00222"></a><span class="lineno">  222</span>&#160;    <span class="comment">/* Gx^2, Gy^2 and Gx*Gy */</span></div>
<div class="line"><a name="l00223"></a><span class="lineno">  223</span>&#160;    float16 res = (float16)0.0f;</div>
<div class="line"><a name="l00224"></a><span class="lineno">  224</span>&#160;</div>
<div class="line"><a name="l00225"></a><span class="lineno">  225</span>&#160;    <span class="comment">/* Compute row */</span></div>
<div class="line"><a name="l00226"></a><span class="lineno">  226</span>&#160;    <span class="keywordflow">for</span>(<span class="keywordtype">int</span> i = -2; i &lt; 3; i++)</div>
<div class="line"><a name="l00227"></a><span class="lineno">  227</span>&#160;    {</div>
<div class="line"><a name="l00228"></a><span class="lineno">  228</span>&#160;        res += <a class="code" href="harris__corners_8cl.xhtml#a71d10f5d9e840b6d270620a2cd856926">harris_score_1x5</a>(&amp;src_gx, &amp;src_gy, i);</div>
<div class="line"><a name="l00229"></a><span class="lineno">  229</span>&#160;    }</div>
<div class="line"><a name="l00230"></a><span class="lineno">  230</span>&#160;</div>
<div class="line"><a name="l00231"></a><span class="lineno">  231</span>&#160;    float4 gx2  = res.s0123;</div>
<div class="line"><a name="l00232"></a><span class="lineno">  232</span>&#160;    float4 gy2  = res.s4567;</div>
<div class="line"><a name="l00233"></a><span class="lineno">  233</span>&#160;    float4 gxgy = res.s89AB;</div>
<div class="line"><a name="l00234"></a><span class="lineno">  234</span>&#160;</div>
<div class="line"><a name="l00235"></a><span class="lineno">  235</span>&#160;    <span class="comment">/* Compute trace and determinant */</span></div>
<div class="line"><a name="l00236"></a><span class="lineno">  236</span>&#160;    float4 trace = gx2 + gy2;</div>
<div class="line"><a name="l00237"></a><span class="lineno">  237</span>&#160;    float4 det   = gx2 * gy2 - (gxgy * gxgy);</div>
<div class="line"><a name="l00238"></a><span class="lineno">  238</span>&#160;</div>
<div class="line"><a name="l00239"></a><span class="lineno">  239</span>&#160;    <span class="comment">/* Compute harris score */</span></div>
<div class="line"><a name="l00240"></a><span class="lineno">  240</span>&#160;    float4 mc = (det - (sensitivity * (trace * trace))) * pow4_normalization_factor;</div>
<div class="line"><a name="l00241"></a><span class="lineno">  241</span>&#160;</div>
<div class="line"><a name="l00242"></a><span class="lineno">  242</span>&#160;    mc = select(0.0f, mc, mc &gt; (float4)strength_thresh);</div>
<div class="line"><a name="l00243"></a><span class="lineno">  243</span>&#160;</div>
<div class="line"><a name="l00244"></a><span class="lineno">  244</span>&#160;    vstore4(mc, 0, (__global <span class="keywordtype">float</span> *)vc.<a class="code" href="struct_image.xhtml#acf52c23cbd7424606c10a606524e3e32">ptr</a>);</div>
<div class="line"><a name="l00245"></a><span class="lineno">  245</span>&#160;}</div>
<div class="ttc" id="harris__corners_8cl_xhtml_a71d10f5d9e840b6d270620a2cd856926"><div class="ttname"><a href="harris__corners_8cl.xhtml#a71d10f5d9e840b6d270620a2cd856926">harris_score_1x5</a></div><div class="ttdeci">float16 harris_score_1x5(Image *src_gx, Image *src_gy, int row)</div><div class="ttdoc">Function for calculating harris score 1x5. </div><div class="ttdef"><b>Definition:</b> <a href="harris__corners_8cl_source.xhtml#l00138">harris_corners.cl:138</a></div></div>
<div class="ttc" id="helpers_8h_xhtml_aebe814363556c244be043b13e7969197"><div class="ttname"><a href="helpers_8h.xhtml#aebe814363556c244be043b13e7969197">CONVERT_TO_IMAGE_STRUCT</a></div><div class="ttdeci">#define CONVERT_TO_IMAGE_STRUCT(name)</div><div class="ttdef"><b>Definition:</b> <a href="helpers_8h_source.xhtml#l00096">helpers.h:96</a></div></div>
<div class="ttc" id="struct_image_xhtml"><div class="ttname"><a href="struct_image.xhtml">Image</a></div><div class="ttdoc">Structure to hold Image information. </div><div class="ttdef"><b>Definition:</b> <a href="helpers_8h_source.xhtml#l00134">helpers.h:134</a></div></div>
<div class="ttc" id="struct_image_xhtml_acf52c23cbd7424606c10a606524e3e32"><div class="ttname"><a href="struct_image.xhtml#acf52c23cbd7424606c10a606524e3e32">Image::ptr</a></div><div class="ttdeci">__global uchar * ptr</div><div class="ttdoc">Pointer to the starting postion of the buffer. </div><div class="ttdef"><b>Definition:</b> <a href="helpers_8h_source.xhtml#l00136">helpers.h:136</a></div></div>
</div><!-- fragment -->
</div>
</div>
<a class="anchor" id="a468ac2728816485f017f51faeb0a7d65"></a>
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname">__kernel void harris_score_7x7 </td>
          <td>(</td>
          <td class="paramtype">__global uchar *&#160;</td>
          <td class="paramname"><em>src_gx_ptr</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src_gx_stride_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src_gx_step_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src_gx_stride_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src_gx_step_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src_gx_offset_first_element_in_bytes</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">__global uchar *&#160;</td>
          <td class="paramname"><em>src_gy_ptr</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src_gy_stride_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src_gy_step_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src_gy_stride_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src_gy_step_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>src_gy_offset_first_element_in_bytes</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">__global uchar *&#160;</td>
          <td class="paramname"><em>vc_ptr</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>vc_stride_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>vc_step_x</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>vc_stride_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>vc_step_y</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">uint&#160;</td>
          <td class="paramname"><em>vc_offset_first_element_in_bytes</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">float&#160;</td>
          <td class="paramname"><em>sensitivity</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">float&#160;</td>
          <td class="paramname"><em>strength_thresh</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">float&#160;</td>
          <td class="paramname"><em>pow4_normalization_factor</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
        </tr>
      </table>
</div><div class="memdoc">

<p>Function running harris score on 7x7 block size. </p>
<dl class="section attention"><dt>Attention</dt><dd>: The input data type should be passed using a compile option -DDATA_TYPE. Supported types: short and int. e.g. -DDATA_TYPE=short.</dd></dl>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramdir">[in]</td><td class="paramname">src_gx_ptr</td><td>Pointer to the first source image. Supported data types: S16, S32 </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src_gx_stride_x</td><td>Stride of the source image in X dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src_gx_step_x</td><td>src_gx_stride_x * number of elements along X processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src_gx_stride_y</td><td>Stride of the source image in Y dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src_gx_step_y</td><td>src_gx_stride_y * number of elements along Y processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src_gx_offset_first_element_in_bytes</td><td>The offset of the first element in the source image </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src_gy_ptr</td><td>Pointer to the second source image. Supported data types: S16, S32 </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src_gy_stride_x</td><td>Stride of the destination image in X dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src_gy_step_x</td><td>src_gy_stride_x * number of elements along X processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src_gy_stride_y</td><td>Stride of the destination image in Y dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src_gy_step_y</td><td>src_gy_stride_y * number of elements along Y processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">src_gy_offset_first_element_in_bytes</td><td>The offset of the first element in the destination image </td></tr>
    <tr><td class="paramdir">[out]</td><td class="paramname">vc_ptr</td><td>Pointer to the destination image. Supported data types: F32 </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">vc_stride_x</td><td>Stride of the destination image in X dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">vc_step_x</td><td>vc_stride_x * number of elements along X processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">vc_stride_y</td><td>Stride of the destination image in Y dimension (in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">vc_step_y</td><td>vc_stride_y * number of elements along Y processed per workitem(in bytes) </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">vc_offset_first_element_in_bytes</td><td>The offset of the first element in the destination image </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">sensitivity</td><td>Sensitivity threshold k from the Harris-Stephens equation </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">strength_thresh</td><td>Minimum threshold with which to eliminate Harris Corner scores </td></tr>
    <tr><td class="paramdir">[in]</td><td class="paramname">pow4_normalization_factor</td><td>Normalization factor to apply harris score </td></tr>
  </table>
  </dd>
</dl>

<p>Definition at line <a class="el" href="harris__corners_8cl_source.xhtml#l00341">341</a> of file <a class="el" href="harris__corners_8cl_source.xhtml">harris_corners.cl</a>.</p>

<p>References <a class="el" href="helpers_8h_source.xhtml#l00096">CONVERT_TO_IMAGE_STRUCT</a>, <a class="el" href="harris__corners_8cl_source.xhtml#l00253">harris_score_1x7()</a>, and <a class="el" href="helpers_8h_source.xhtml#l00136">Image::ptr</a>.</p>
<div class="fragment"><div class="line"><a name="l00348"></a><span class="lineno">  348</span>&#160;{</div>
<div class="line"><a name="l00349"></a><span class="lineno">  349</span>&#160;    <a class="code" href="struct_image.xhtml">Image</a> src_gx = <a class="code" href="helpers_8h.xhtml#aebe814363556c244be043b13e7969197">CONVERT_TO_IMAGE_STRUCT</a>(src_gx);</div>
<div class="line"><a name="l00350"></a><span class="lineno">  350</span>&#160;    <a class="code" href="struct_image.xhtml">Image</a> src_gy = <a class="code" href="helpers_8h.xhtml#aebe814363556c244be043b13e7969197">CONVERT_TO_IMAGE_STRUCT</a>(src_gy);</div>
<div class="line"><a name="l00351"></a><span class="lineno">  351</span>&#160;    <a class="code" href="struct_image.xhtml">Image</a> vc     = <a class="code" href="helpers_8h.xhtml#aebe814363556c244be043b13e7969197">CONVERT_TO_IMAGE_STRUCT</a>(vc);</div>
<div class="line"><a name="l00352"></a><span class="lineno">  352</span>&#160;</div>
<div class="line"><a name="l00353"></a><span class="lineno">  353</span>&#160;    <span class="comment">/* Gx^2, Gy^2 and Gx*Gy */</span></div>
<div class="line"><a name="l00354"></a><span class="lineno">  354</span>&#160;    float16 res = (float16)0.0f;</div>
<div class="line"><a name="l00355"></a><span class="lineno">  355</span>&#160;</div>
<div class="line"><a name="l00356"></a><span class="lineno">  356</span>&#160;    <span class="comment">/* Compute row */</span></div>
<div class="line"><a name="l00357"></a><span class="lineno">  357</span>&#160;    <span class="keywordflow">for</span>(<span class="keywordtype">int</span> i = -3; i &lt; 4; i++)</div>
<div class="line"><a name="l00358"></a><span class="lineno">  358</span>&#160;    {</div>
<div class="line"><a name="l00359"></a><span class="lineno">  359</span>&#160;        res += <a class="code" href="harris__corners_8cl.xhtml#a2fadfd6378605824bb7926e1ac0123fb">harris_score_1x7</a>(&amp;src_gx, &amp;src_gy, i);</div>
<div class="line"><a name="l00360"></a><span class="lineno">  360</span>&#160;    }</div>
<div class="line"><a name="l00361"></a><span class="lineno">  361</span>&#160;</div>
<div class="line"><a name="l00362"></a><span class="lineno">  362</span>&#160;    float4 gx2  = res.s0123;</div>
<div class="line"><a name="l00363"></a><span class="lineno">  363</span>&#160;    float4 gy2  = res.s4567;</div>
<div class="line"><a name="l00364"></a><span class="lineno">  364</span>&#160;    float4 gxgy = res.s89AB;</div>
<div class="line"><a name="l00365"></a><span class="lineno">  365</span>&#160;</div>
<div class="line"><a name="l00366"></a><span class="lineno">  366</span>&#160;    <span class="comment">/* Compute trace and determinant */</span></div>
<div class="line"><a name="l00367"></a><span class="lineno">  367</span>&#160;    float4 trace = gx2 + gy2;</div>
<div class="line"><a name="l00368"></a><span class="lineno">  368</span>&#160;    float4 det   = gx2 * gy2 - (gxgy * gxgy);</div>
<div class="line"><a name="l00369"></a><span class="lineno">  369</span>&#160;</div>
<div class="line"><a name="l00370"></a><span class="lineno">  370</span>&#160;    <span class="comment">/* Compute harris score */</span></div>
<div class="line"><a name="l00371"></a><span class="lineno">  371</span>&#160;    float4 mc = (det - (sensitivity * (trace * trace))) * pow4_normalization_factor;</div>
<div class="line"><a name="l00372"></a><span class="lineno">  372</span>&#160;</div>
<div class="line"><a name="l00373"></a><span class="lineno">  373</span>&#160;    mc = select(0.0f, mc, mc &gt; (float4)strength_thresh);</div>
<div class="line"><a name="l00374"></a><span class="lineno">  374</span>&#160;</div>
<div class="line"><a name="l00375"></a><span class="lineno">  375</span>&#160;    vstore4(mc, 0, (__global <span class="keywordtype">float</span> *)vc.<a class="code" href="struct_image.xhtml#acf52c23cbd7424606c10a606524e3e32">ptr</a>);</div>
<div class="line"><a name="l00376"></a><span class="lineno">  376</span>&#160;}</div>
<div class="ttc" id="helpers_8h_xhtml_aebe814363556c244be043b13e7969197"><div class="ttname"><a href="helpers_8h.xhtml#aebe814363556c244be043b13e7969197">CONVERT_TO_IMAGE_STRUCT</a></div><div class="ttdeci">#define CONVERT_TO_IMAGE_STRUCT(name)</div><div class="ttdef"><b>Definition:</b> <a href="helpers_8h_source.xhtml#l00096">helpers.h:96</a></div></div>
<div class="ttc" id="struct_image_xhtml"><div class="ttname"><a href="struct_image.xhtml">Image</a></div><div class="ttdoc">Structure to hold Image information. </div><div class="ttdef"><b>Definition:</b> <a href="helpers_8h_source.xhtml#l00134">helpers.h:134</a></div></div>
<div class="ttc" id="struct_image_xhtml_acf52c23cbd7424606c10a606524e3e32"><div class="ttname"><a href="struct_image.xhtml#acf52c23cbd7424606c10a606524e3e32">Image::ptr</a></div><div class="ttdeci">__global uchar * ptr</div><div class="ttdoc">Pointer to the starting postion of the buffer. </div><div class="ttdef"><b>Definition:</b> <a href="helpers_8h_source.xhtml#l00136">helpers.h:136</a></div></div>
<div class="ttc" id="harris__corners_8cl_xhtml_a2fadfd6378605824bb7926e1ac0123fb"><div class="ttname"><a href="harris__corners_8cl.xhtml#a2fadfd6378605824bb7926e1ac0123fb">harris_score_1x7</a></div><div class="ttdeci">float16 harris_score_1x7(Image *src_gx, Image *src_gy, int row)</div><div class="ttdoc">Function for calculating harris score 1x7. </div><div class="ttdef"><b>Definition:</b> <a href="harris__corners_8cl_source.xhtml#l00253">harris_corners.cl:253</a></div></div>
</div><!-- fragment -->
</div>
</div>
</div><!-- contents -->
</div><!-- doc-content -->
<!-- start footer part -->
<div id="nav-path" class="navpath"><!-- id is needed for treeview function! -->
  <ul>
    <li class="navelem"><a class="el" href="dir_55b5a5006e943fb664ff8cff3cfe7768.xhtml">src</a></li><li class="navelem"><a class="el" href="dir_f6c3ae42d7e27145d0a3c3e38ca1c000.xhtml">core</a></li><li class="navelem"><a class="el" href="dir_1b7ae9123c88e650426d50d95c19d414.xhtml">CL</a></li><li class="navelem"><a class="el" href="dir_b7c3d80b0dadb2139bc73b7161751c12.xhtml">cl_kernels</a></li><li class="navelem"><a class="el" href="harris__corners_8cl.xhtml">harris_corners.cl</a></li>
    <li class="footer">Generated on Thu Oct 12 2017 14:26:35 for Compute Library by
    <a href="http://www.doxygen.org/index.html">
    <img class="footer" src="doxygen.png" alt="doxygen"/></a> 1.8.6 </li>
  </ul>
</div>
</body>
</html>
